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  • 1
    ISSN: 1432-2072
    Keywords: Conditioned Taste Aversions ; Amphetamine ; Fenfluramine ; Tolerance ; Cross-Tolerance ; Drug Abuse ; Animal Models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Conditioned taste aversions (C.T.As) established in rats to 0.1% sodium saccharin by intra-peritoneal injections of dl-fenfluramine hydrochloride (6 mg per kg) or d-amphetamine sulphate (2.0 mg per kg) were found to be significantly attenuated, but not abolished altogether, by chronic pretreatment (over 9 days) with the specific drug. Prior treatment with fenfluramine attenuated the aversive effects of amphetamine, but the converse was found not to be the case. These results are considered to refute the “Unnatural need state” and “Novelty” hypotheses of the effects of prior drug experience on the establishment of C.T.As. An alternative explanation of such effects in terms of tolerance is considered, and the possible relevance of the results to studies of drug abuse in humans discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 45 (1975), S. 119-123 
    ISSN: 1432-2072
    Keywords: Amphetamine ; Conditioned taste aversion ; Alpha-methyl-p-tyrosine ; Catecholamines ; Drug abuse ; Self administration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pretreatment with alpha-methyl-p-tyrosine (AMPT) was found to block a conditioned taste aversion (C.T.A.) induced by injection of d-amphetamine sulphate (2.0 mg/kg per kg, i.p.) immediately after first access to 0.1% sodium saccharin. This finding implicates catecholaminergic systems in the induction of C.T.As by amphetamine, and suggests that the aversive properties of the drug are mediated by neurochemical systems which are similar to, or the same as, those which mediate the stimulant, anorectic and rewarding effects of the drug. The results refute a recent suggestion that the use of AMPT in the study of neurochemical mechanisms involved in drug induced taste aversions is precluded by the ability of AMPT itself to induce a C.T.A.; and illustrate an important distinction between pretreatment and post-treatment in taste aversion studies. The results provide further support for recent suggestions that the study of drug induced C.T.As may be of significance for an understanding of drug abuse.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2072
    Keywords: SKF 525 A ; Activity Analysis ; Drug Metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract SKF 525 A was found possess sedative properties in rats at doses of 25 and 50 mg per kg, when injected intraperitoneally. The behavioural effects of the drug were assessed in two ways. Firstly, by “Time Sampling Behavioural Categorisation” of exploratory behaviour; and secondly by activity measurements obtained with an ultrasonic motion recorder. The results clearly demonstrate that SKF 525A has sedative properties in rats at doses which are conventionally used to inhibit metabolism of a wide range of drugs. The implications of these results for the use of SKF 525 A in the study of the actions of psychotropic drugs are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 53 (1977), S. 97-102 
    ISSN: 1432-2072
    Keywords: Fenfluramine ; Norfenfluramine ; Amphetamine ; Drug discrimination ; Stimulus properties of drugs ; Fixed ratio responding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fenfluramine at a dose of 3.0 mg/kg was found to possess discriminative stimulus properties controlling lever selection by rats in a two-lever operant task. Subjects trained to discriminate the ‘Fenfluramine cue’ failed to generalize to amphetamine in extinction tests at doses between 0.25 and 1.0 mg/kg. Subjects did, however, generalize to the fenfluramine metabolite, norfenfluramine, at a dose of 2.0 mg/kg. These data provide further evidence for a pharmacological difference between fenfluramine and amphetamine, and support the hypothesis that norfenfluramine is an active metabolite of fenfluramine. The relevance of these findings to theoretical and methodological aspects of drug discrimination studies is considered.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 60 (1978), S. 73-79 
    ISSN: 1432-2072
    Keywords: Serotonin ; Response inhibition ; Raphe nucleus ; P-chlorophenylalanine ; Passive-avoidance learning ; Omission training
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two behavioural paradigms were used to test the effects of serotonin depletion on a specific form of response inhibition. Treatment with both p-chlorophenylalanine (p-CPA) at 200 mg/kg and lesions of the medial raphe nucleus impaired the acquisition of a step-off passive-avoidance response. The experimental design allowed the elimination of alternative interpretations in terms of increased sensitivity to shock and increased responsiveness to stimuli. p-CPA also impaired response inhibition during an omission-training schedule. The results of the three studies support a general role of serotonin in withholding specific instrumental (reinforced) motor actions. The results contrast with those of studies supporting a role of noradrenaline in response inhibition. A tentative conclusion supports Konorski's (1967) suggestion for differentiation of various types of response inhibition that are mediated by different neurochemical systems.
    Type of Medium: Electronic Resource
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